While there’s an array of unofficial third-party keyboards willing to pair up with your 7-inch RIM slate, an approved peripheral is likely to be the better option. At least, it’s what the BlackBerry-authorized add-on aims to accomplish. Dubbed Mini Keyboard, which also doubles as a “convertible” case, it’s said to start shipping on March 23rd for $120, packing a multitouch trackpad and claiming up to a month of juice on a single charge. Additionally, the device features 128bit encryption to put your paranoia at ease when you’re using that shiny OS 2.0. We’ve yet to hear an official word from RIM about price and availability, however, the source below seems to be taking pre-orders now.